Qt: Handle mouse move events properly (#678)

include/panda_qt/main_window.hpp

@@ -146,12 +146,15 @@ class MainWindow : public QMainWindow {
 	void closeEvent(QCloseEvent* event) override;
 	void keyPressEvent(QKeyEvent* event) override;
 	void keyReleaseEvent(QKeyEvent* event) override;
+
 	void mousePressEvent(QMouseEvent* event) override;
 	void mouseReleaseEvent(QMouseEvent* event) override;
+	void mouseMoveEvent(QMouseEvent* event) override;
 
 	void loadLuaScript(const std::string& code);
 	void reloadShader(const std::string& shader);
 	void editCheat(u32 handle, const std::vector<uint8_t>& cheat, const std::function<void(u32)>& callback);
 
 	void handleScreenResize(u32 width, u32 height);
+	void handleTouchscreenPress(QMouseEvent* event);
 };

src/panda_qt/main_window.cpp

@@ -487,6 +487,24 @@ void MainWindow::keyReleaseEvent(QKeyEvent* event) {
 
 void MainWindow::mousePressEvent(QMouseEvent* event) {
 	if (event->button() == Qt::MouseButton::LeftButton) {
+		// We handle actual mouse press & movement logic inside the mouseMoveEvent handler
+		handleTouchscreenPress(event);
+	}
+}
+
+void MainWindow::mouseMoveEvent(QMouseEvent* event) {
+	if (event->buttons().testFlag(Qt::MouseButton::LeftButton)) {
+		handleTouchscreenPress(event);
+	}
+}
+
+void MainWindow::mouseReleaseEvent(QMouseEvent* event) {
+	if (event->button() == Qt::MouseButton::LeftButton) {
+		sendMessage(EmulatorMessage{.type = MessageType::ReleaseTouchscreen});
+	}
+}
+
+void MainWindow::handleTouchscreenPress(QMouseEvent* event) {
 	const QPointF clickPos = event->globalPosition();
 	const QPointF widgetPos = screen->mapFromGlobal(clickPos);
 
@@ -511,13 +529,6 @@ void MainWindow::mousePressEvent(QMouseEvent* event) {
 		}
 	}
 }
-}
-
-void MainWindow::mouseReleaseEvent(QMouseEvent* event) {
-	if (event->button() == Qt::MouseButton::LeftButton) {
-		sendMessage(EmulatorMessage{.type = MessageType::ReleaseTouchscreen});
-	}
-}
 
 void MainWindow::loadLuaScript(const std::string& code) {
 	EmulatorMessage message{.type = MessageType::LoadLuaScript};